Drilling rig with automatic drill rod connection and construction method thereof

Abstract

The present invention discloses a drilling rig capable of automatically adding drill rods and a construction method thereof, which belongs to the technical field of pile foundation construction, and includes a drilling rig platform, a mast, a guide rail, a crane, a power head system, a main drill rod system, a secondary drill rod system, and a swivel joint; a mast is installed on the drilling rig platform, a crane is connected to the upper end of the mast, and a guide rail is provided along the entire length of the mast; the power head in the power head system is a through-hole power head, and the power head is slidably connected to the guide rail; the main drill rod system is rotated and fixed by the power head system, and the secondary drill rod system, the drilling rig platform, the mast, the guide rail, and the crane together form a linkage structure, the main drill rod system, the secondary drill rod system, and the guide rail are in the same plane, and the drill rod addition is achieved by adjusting the position of the secondary drill rod system. Construction steps: assembly and preparation of the drilling rig, lowering of the main drill rod, drill rod addition, lowering of the secondary drill rod, and lifting of the drill rod. The present invention solves the technical problem of low efficiency in adding drill rods by quickly switching and connecting the two drill rods.

Description

Technical Field

[0001] The present invention relates to the technical field of pile foundation construction, and in particular to a drilling rig capable of automatically adding a drill rod and a construction method thereof. Background Art

[0002] A pile driver is a complex machine consisting of a machine, a unit, and a mechanism. Different pile drivers have different application scenarios. A pile driver uses a drill to penetrate the soil, spraying a curing agent that mixes with the in-situ soil to form a pile. Commonly used drilling rigs include single-axis, dual-axis, triple-axis, and five-axis drilling rigs. The pile frames are large and often exceed 30 meters in height. For piles exceeding 30 meters, drill rod extensions are required to achieve deeper depths. With technological advancements, the methods for extending drill rod extensions are also evolving.

[0003] Chinese invention patent CN1000543265C introduces the most traditional method of adding drill rods: (1) the drill rod to be connected is placed vertically into a prefabricated hole below the ground, with the drill rod joint located above the ground; (2) pile construction begins, and after the drill rod is drilled into the ground to a certain depth, drilling is stopped, and the drill rod joint should be located above the ground; (3) the drill rod joint is disassembled, and the drill rod below the joint remains at the working pile position, while the drill rod above the joint moves with the pile driver; (4) the pile driver drives the drill rod above the joint to move to the drill rod to be connected, and connects and fixes the drill rod above the joint to the top end of the drill rod to be connected to form an extended drill rod; (5) the pile driver moves the extended drill rod to the working pile position, connects and fixes the drill rod below the joint left there to the bottom end of the extended drill rod, and then continues construction. Currently, with the development of mechanization and automation, this process is no longer used.

[0004] Chinese invention patent CN104481431B introduces a mechanism for adding drill rods to a drilling rig. First, the drilling rig is started so that the drilling rig mast is perpendicular to the ground. The fixing pin is pulled out so that the external drill rod part of the mechanism is roughly horizontal with the ground. The drill rod is moved along the opening direction of the clamp assembly bayonet portion until it is blocked by a block. The pin is pulled out to adjust the size of the clamp assembly bayonet portion so that the clamp assembly holds the drill rod. The pin is inserted and locked. The pull pin and the drill rod are moved so that the drill rod is parallel to the mast. The fixing pin is then inserted to fix the slewing support on the slewing seat. The quick-pull pin is then pulled out. The rotary arm is rotated to move the drill rod to the center of rotation of the power head. The power head is rotated to tighten the drill rod. After the drill rod is tightened, the pin is pulled out to separate the caliper assembly from the drill rod. The quick-pull pin is then inserted to complete the assembly function of the drill rod. The disassembly of the drill rod can be completed by performing the above steps in reverse. This mechanism uses a mechanical gripper to pick up the drill rod on the ground, and then completes the docking of the drill rod through manual and mechanical methods. This mechanism is suitable for equipment such as anchor drilling rigs with smaller drill rods, but is not suitable for equipment with longer drill rods. First, the length of a single section of drill rod basically exceeds ten meters, and the mechanical gripper cannot move such a long distance. Second, the drill rod is heavy and the mechanical gripper finds it difficult to lift it.

[0005] Chinese utility model patent CN205689147U introduces an automatic drill rod connecting and unloading mechanism for drilling engineering applications. The automatic connecting and unloading of drill rods is carried out by installing a drill rod cabin on the side of the column and combining it with a manipulator. The upper assembly can be driven to move or rotate at least horizontally relative to the column through a swing arm adjustment mechanism to achieve the connection of drill rods. However, this structure can only be applied to small equipment such as anchor drilling rigs, and the drill rods are connected by threads. The drill rods of current drilling rigs are relatively thick, long, and heavy, and are multi-channel drill rods that cannot be connected by threads. This also means that the above-mentioned technology and similar ideas cannot be used to achieve rapid connection of rods.

[0006] In summary, in different application scenarios, the selection of drilling rigs and drill rods varies greatly, which leads to significant differences in the mechanisms for connecting drill rods. The connecting rods currently designed are mostly used for small drill rods supporting anchor drilling rigs, and there are no obvious technical improvements for the connecting rods on drilling rigs. The applicant of this patent proposed a device for connecting rods in 2019. Although it solved the problem to a certain extent, the efficiency is still not high enough. Based on this, the present invention proposes a drilling rig with automatic connecting drill rods and a construction method thereof. The device can solve the problem of long and heavy drill rods that are not suitable for connection through automated machinery. Summary of the Invention

[0007] In response to the above technical problems existing in the prior art, the present invention proposes a drilling rig with automatic drill pipe connection and its construction method, which overcomes the shortcomings of the prior art. By quickly switching and connecting the two drill pipes, the technical problem of low drill pipe connection efficiency is solved.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A drilling rig with automatic drill rod connection, characterized in that it includes a drilling rig platform, a mast, a guide rail, a crown block, a power head system, a main drill rod system, a secondary drill rod system, and a rotary joint; a mast is installed on the drilling rig platform, a crown block is connected to the upper end of the mast, and a guide rail is provided along the entire length of the mast; the power head in the power head system is a through-hole power head, and the power head is slidably connected to the guide rail; the main drill rod system is rotated and fixed by the power head system, and the secondary drill rod system, the drilling rig platform, the mast, the guide rail, and the crown block together form a linkage structure, the main drill rod system, the secondary drill rod system and the guide rail are in the same plane, and the position of the secondary drill rod system in the plane is adjusted to achieve coaxial docking with the main drill rod system.

[0010] Preferably, the power head system includes a power head, a power head winch, and a power head wire rope; the power head is connected to the power head winch through the power head wire rope, and the power head wire rope is divided into an upper rope and a lower rope. One end of the upper rope is connected to the power head winch, passes through the pulley at the top of the mast and is fixed to the upper part of the power head, and one end of the lower rope is connected to the power head winch, passes through the pulley at the bottom of the mast and is fixed to the lower part of the power head, and the power head is slidably connected to the guide rail.

[0011] Preferably, the main drill rod system includes a main drill rod support plate, a main drill rod, a main oil cylinder, and a main connecting rod; the auxiliary drill rod system includes an auxiliary drill rod support plate, an auxiliary drill rod, an auxiliary oil cylinder, an auxiliary connecting rod, an auxiliary drill rod winch, and an auxiliary drill rod wire rope; the guide rail is slidingly connected to the main drill rod support plate and the auxiliary drill rod support plate, a power head winch is connected to the mast by bolts, and the drilling rig platform is bolted to the auxiliary drill rod winch. The auxiliary drill rod winch is connected to the auxiliary drill rod wire rope, and the auxiliary drill rod wire rope passes through the overhead crane and is connected to the swivel joint on the auxiliary drill rod, the auxiliary connecting rod is hinged to the auxiliary drill rod support plate and the swivel joint on the auxiliary drill rod, and the auxiliary oil cylinder is hinged to the auxiliary drill rod support plate and the auxiliary connecting rod; the main connecting rod is hinged to the main drill rod support plate and the swivel joint on the main drill rod, and the main oil cylinder is hinged to the main drill rod support plate and the main connecting rod.

[0012] Preferably, an operating platform is welded on the drilling rig platform, a safety fence is arranged around the operating platform, a fixed rod is welded on the operating platform, and a fixed collar is welded on the upper end of the fixed rod; a safety lasso is provided on the secondary connecting rod, the safety lasso is sleeved on the upper part of the secondary drill rod, and the fixed collar is sleeved on the lower part of the secondary drill rod.

[0013] Preferably, the power head winch is a bidirectional pressure winch.

[0014] Preferably, the diameter of the fixing ring ranges from 100 mm to 400 mm.

[0015] Preferably, the safety noose is a steel strand.

[0016] A construction method for a drilling rig capable of automatically connecting drill rods is characterized in that the construction is carried out using the drilling rig capable of automatically connecting drill rods. The specific construction steps are as follows:

[0017] Step 1: Drilling Rig Assembly and Preparation

[0018] Select the appropriate drill bit according to the different strata, match the main drill rod, auxiliary drill rod and mast of different lengths according to the designed pile length, and assemble the drilling rig according to the drilling rig assembly instructions;

[0019] Step 2: Lowering the main drill pipe

[0020] The drill rod holder on the power head clamps the main drill rod, and the power head starts to rotate. The power head winch is started, and the power head moves downward along the guide rail through the power head wire rope. At the same time, the rotary joint on the main drill rod pulls the main drill rod support plate downward through the main connecting rod and the main oil cylinder, allowing the drill bit to drill into the soil.

[0021] When the power head moves downward to a distance of 30cm~50cm from the upper part of the operating platform, the power head winch is stopped, the power head stops rotating, the drill rod clamp on the power head is loosened, the power head winch is started, and the power head is pulled upward along the guide rail by the power head wire rope. When the power head moves to the upper end of the main drill rod, the power head winch is stopped, the drill rod clamp on the power head is clamped, the power head starts rotating, the power head winch is started, and the power head is pulled downward along the guide rail by the power head wire rope until the power head and the upper end of the main drill rod move together to a position 30cm~50cm above the operating platform;

[0022] Step 3: Drill pipe connection

[0023] Remove the swivel joint of the main drill pipe, retract the main oil cylinder to separate the main connecting rod with the swivel joint from the main drill pipe, release the connection between the fixed collar and the auxiliary drill pipe, retract the auxiliary oil cylinder to make the joint of the auxiliary drill pipe and the main drill pipe coaxial, lower the auxiliary drill pipe by hoisting it, ensure that the auxiliary drill pipe is connected to the main drill pipe, insert a pin at the joint between the main drill pipe and the auxiliary drill pipe, and the drill pipe connection is completed;

[0024] Step 4: Lower the auxiliary drill pipe into the hole

[0025] Start the power head winch, pull the power head upward along the guide rail through the power head wire rope until the power head reaches its maximum ascending stroke, stop the power head winch, clamp the drill rod clamp on the power head, start the power head rotation, start the power head winch, pull the power head downward along the guide rail through the power head wire rope, and at the same time, the rotary joint on the auxiliary drill rod pulls the auxiliary drill rod support plate downward through the auxiliary connecting rod and auxiliary oil cylinder until drilling reaches the designed depth;

[0026] Step 5: Lift the drill pipe

[0027] The order of lifting the drill is in the reverse order of the drilling sequence until the drill bit is lifted above the ground.

[0028] The beneficial technical effects brought about by the present invention are:

[0029] (1) The rapid conversion and connection between the two drill rods solves the technical problem of low efficiency in adding drill rods. (2) The central placement of the power head solves the technical problem of equipment overturning due to excessive height. (3) The auxiliary drill rod is fixed at both ends to prevent it from shaking during construction. The safety noose at the upper end of the auxiliary drill rod serves as a secondary safety guarantee for the auxiliary drill rod, preventing it from detaching from the swivel joint and causing safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a structural schematic diagram of a drilling rig capable of automatically adding drill rods and a construction method thereof.

[0031] Figure 2 The present invention is a structural schematic diagram of a drilling rig capable of automatically adding drill rods and a fixing collar in a construction method thereof.

[0032] Figure 3 The present invention is a structural schematic diagram of a safety lasso in a drilling rig capable of automatically adding drill rods and a construction method thereof.

[0033] Figure 4 The present invention provides a construction flow chart of a drilling rig capable of automatically adding drill rods and a construction method thereof.

[0034] In the figure: 1-drilling rig platform, 2-auxiliary drill pipe winch, 3-power head winch, 4-auxiliary drill pipe wire rope, 5-power head wire rope, 6-mast, 7-guide rail, 8-overhead crane, 9-main drill pipe support plate, 10-auxiliary drill pipe support plate, 11-main drill pipe, 12-auxiliary drill pipe, 13-power head, 14-operating platform, 15-safety fence, 16-fixing rod, 17-fixing collar, 18-swivel joint, 19-main cylinder, 20-main connecting rod, 21-auxiliary cylinder, 22-auxiliary connecting rod, 23-safety noose. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1:

[0037] When the project requires construction of piles with a depth of 50 meters, the following method is used for construction:

[0038] like Figures 1 to 4 As shown, a drilling rig with automatic drill rod connection includes a drilling rig platform 1, a mast 6, a guide rail 7, a crown block 8, a power head system, a main drill rod system, a secondary drill rod system, and a swivel joint 18; a mast 6 is installed on the drilling rig platform 1, the upper end of the mast 6 is connected to the crown block 8, and the guide rail 7 is provided along the entire length of the mast 6; the power head 13 in the power head system is a through-hole power head, and the power head 13 is slidably connected to the guide rail 7; the main drill rod system is rotated and fixed by the power head system, and the secondary drill rod system, the drilling rig platform 1, the mast 6, the guide rail 7, and the crown block 8 together form a linkage structure, the main drill rod system, the secondary drill rod system and the guide rail 7 are in the same plane, and the position of the secondary drill rod system in the plane is adjusted to achieve coaxial docking with the main drill rod system.

[0039] Preferably, the power head system includes a power head 13, a power head winch 3, and a power head wire rope 5; the power head 13 is connected to the power head winch 3 through the power head wire rope 5, and the power head wire rope 5 is divided into an upper rope and a lower rope. One end of the upper rope is connected to the power head winch 3, passes through the pulley at the top of the mast 6 and is fixed to the upper part of the power head 13, and one end of the lower rope is connected to the power head winch 3, passes through the pulley at the bottom of the mast 6 and is fixed to the lower part of the power head 13. The power head 13 is slidably connected to the guide rail 7.

[0040] Preferably, the main drill rod system includes a main drill rod support plate 9, a main drill rod 11, a main oil cylinder 19, and a main connecting rod 20; the auxiliary drill rod system includes an auxiliary drill rod support plate 10, an auxiliary drill rod 12, an auxiliary oil cylinder 21, an auxiliary connecting rod 22, an auxiliary drill rod winch 2, and an auxiliary drill rod wire rope 4; the guide rail 7 is slidably connected to the main drill rod support plate 9 and the auxiliary drill rod support plate 10, the mast 6 is connected to the power head winch 3 by bolts, the drilling rig platform 1 is connected to the auxiliary drill rod winch 2 by bolts, and the auxiliary drill rod The winch 2 is connected to the auxiliary drill rod wire rope 4, the auxiliary drill rod wire rope 4 passes through the overhead crane 8 and is connected to the swivel joint 18 on the auxiliary drill rod 12, the auxiliary connecting rod 22 is hinged to the auxiliary drill rod support plate 10 and the swivel joint 18 on the auxiliary drill rod 12, the auxiliary oil cylinder 21 is hinged to the auxiliary drill rod support plate 10 and the auxiliary connecting rod 22; the main connecting rod 20 is hinged to the main drill rod support plate 9 and the swivel joint 18 on the main drill rod 11, and the main oil cylinder 19 is hinged to the main drill rod support plate 9 and the main connecting rod 20.

[0041] Preferably, an operating platform 14 is welded to the drilling rig platform 1, a safety fence 15 is arranged around the operating platform 14, a fixing rod 16 is welded to the operating platform 14, and a fixing collar 17 is welded to the upper end of the fixing rod 16; a safety lasso 23 is provided on the secondary connecting rod 22, the safety lasso 23 is sleeved on the upper part of the secondary drill rod 12, and the fixing collar 17 is sleeved on the lower part of the secondary drill rod 12.

[0042] Preferably, the power head winch 3 is a bidirectional pressure winch.

[0043] Preferably, the diameter of the fixing ring 17 is 300 mm.

[0044] Preferably, the safety noose 23 is a steel strand.

[0045] A construction method of a drilling rig with automatic drill rod connection is provided, wherein the construction is performed using the drilling rig with automatic drill rod connection. The specific construction steps are as follows:

[0046] Step 1: Drilling Rig Assembly and Preparation

[0047] Select the appropriate drill bit according to the different strata, and match the main drill rod 11, auxiliary drill rod 12, and mast 6 of different lengths according to the designed pile length. The main drill rod 11 is 27m long, the auxiliary drill rod 12 is 23m long, and the drill bit is 3m long. Assemble the drilling rig according to the drilling rig assembly instructions.

[0048] Step 2: Main drill rod 11 is lowered into the drill

[0049] The drill rod holder on the power head 13 clamps the main drill rod 11, and the power head 13 starts to rotate. The power head winch 3 is started, and the power head 13 moves downward along the guide rail 7 through the power head wire rope 5. At the same time, the rotary joint 18 on the main drill rod 11 pulls the main drill rod support plate 9 downward through the main connecting rod 20 and the main oil cylinder 19, so that the drill bit drills into the soil.

[0050] When the power head 13 moves downward to a distance of 30 cm to 50 cm from the upper part of the operating platform 14, the power head winch 3 is stopped, the power head 13 stops rotating, the drill rod clamp on the power head 13 is loosened, the power head winch 3 is started, and the power head 13 is pulled upward along the guide rail 7 by the power head wire rope 5. When the power head 13 moves to the upper end of the main drill rod 11, the power head winch 3 is stopped, the drill rod clamp on the power head 13 is clamped, the power head 13 starts to rotate, the power head winch 3 is started, and the power head 13 is pulled downward along the guide rail 7 by the power head wire rope 5 until the power head 13 and the upper end of the main drill rod 11 move together to a position 30 cm to 50 cm above the operating platform 14;

[0051] Step 3: Drill pipe connection

[0052] Remove the swivel joint 18 of the main drill rod 11, retract the main oil cylinder 19 to separate the main connecting rod 20 with the swivel joint 18 from the main drill rod 11, release the connection between the fixing collar 17 and the auxiliary drill rod 12, retract the auxiliary oil cylinder 21 to make the joint of the auxiliary drill rod 12 and the main drill rod 11 coaxial, lower the auxiliary drill rod 12 by the auxiliary drill rod winch 2, ensure that the auxiliary drill rod 12 is connected to the main drill rod 11, and insert a pin at the joint between the main drill rod 11 and the auxiliary drill rod 12. The drill rod connection is completed;

[0053] Step 4: Auxiliary drill rod 12 is lowered into the drill

[0054] Start the power head winch 3, pull the power head 13 upward along the guide rail 7 through the power head wire rope 5 until the power head 13 reaches its maximum ascending stroke, stop the power head winch 3, clamp the drill rod clamp on the power head 13, start the power head 13 to rotate, start the power head winch 3, pull the power head 13 downward along the guide rail 7 through the power head wire rope 5, and at the same time, the rotary joint 18 on the auxiliary drill rod 12 pulls the auxiliary drill rod support plate 10 downward through the auxiliary connecting rod 22 and the auxiliary oil cylinder 21 until the drill reaches the designed depth;

[0055] Step 5: Lift the drill pipe

[0056] The order of lifting the drill is in the reverse order of the drilling sequence until the drill bit is lifted above the ground.

[0057] Example 2:

[0058] like Figures 1 to 4 As shown, a construction method of a drilling rig with automatic drill rod connection is used for construction. The specific construction steps are as follows:

[0059] Step 1: Drilling Rig Assembly and Preparation

[0060] Select the appropriate drill bit according to the different strata, and match the main drill rod 11, auxiliary drill rod 12, and mast 6 of different lengths according to the designed pile length. The main drill rod 11 is 27m long, the auxiliary drill rod 12 is 23m long, and the drill bit is 3m long. Assemble the drilling rig according to the drilling rig assembly instructions.

[0061] Step 2: Main drill rod 11 is lowered into the drill

[0062] The drill rod holder on the power head 13 clamps the main drill rod 11, and the power head 13 starts to rotate. The power head winch 3 is started, and the power head 13 moves downward along the guide rail 7 through the power head wire rope 5. At the same time, the rotary joint 18 on the main drill rod 11 pulls the main drill rod support plate 9 downward through the main connecting rod 20 and the main oil cylinder 19, so that the drill bit drills into the soil.

[0063] When the power head 13 moves downward to a distance of 30 cm to 50 cm from the upper part of the operating platform 14, the power head winch 3 is stopped, the power head 13 stops rotating, the drill rod clamp on the power head 13 is loosened, the power head winch 3 is started, and the power head 13 is pulled upward along the guide rail 7 by the power head wire rope 5. When the power head 13 moves to the upper end of the main drill rod 11, the power head winch 3 is stopped, the drill rod clamp on the power head 13 is clamped, the power head 13 starts to rotate, the power head winch 3 is started, and the power head 13 is pulled downward along the guide rail 7 by the power head wire rope 5 until the power head 13 and the upper end of the main drill rod 11 move together to a position 30 cm to 50 cm above the operating platform 14;

[0064] Step 3: Drill pipe connection

[0065] Remove the swivel joint 18 of the main drill rod 11, retract the main oil cylinder 19 to separate the main connecting rod 20 with the swivel joint 18 from the main drill rod 11, release the connection between the fixing collar 17 and the auxiliary drill rod 12, retract the auxiliary oil cylinder 21 to make the joint of the auxiliary drill rod 12 and the main drill rod 11 coaxial, lower the auxiliary drill rod 12 by the auxiliary drill rod winch 2, ensure that the auxiliary drill rod 12 is connected to the main drill rod 11, and insert a pin at the joint between the main drill rod 11 and the auxiliary drill rod 12. The drill rod connection is completed;

[0066] Step 4: Auxiliary drill rod 12 is lowered into the drill

[0067] Start the power head winch 3, pull the power head 13 upward along the guide rail 7 through the power head wire rope 5 until the power head 13 reaches its maximum ascending stroke, stop the power head winch 3, clamp the drill rod clamp on the power head 13, start the power head 13 to rotate, start the power head winch 3, pull the power head 13 downward along the guide rail 7 through the power head wire rope 5, and at the same time, the rotary joint 18 on the auxiliary drill rod 12 pulls the auxiliary drill rod support plate 10 downward through the auxiliary connecting rod 22 and the auxiliary oil cylinder 21 until the drill reaches the designed depth;

[0068] Step 5: Lift the drill pipe

[0069] The order of lifting the drill is in the reverse order of the drilling sequence until the drill bit is lifted above the ground.

[0070] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention also fall within the scope of protection of the present invention.

Claims

1. A drilling rig with automatic drill pipe connection, characterized in that: It includes a drilling rig platform, a mast, a guide rail, a crown block, a power head system, a main drill rod system, a secondary drill rod system, and a swivel joint; a mast is installed on the drilling rig platform, a crown block is connected to the upper end of the mast, and a guide rail is provided along the entire length of the mast; the power head in the power head system is a through-hole power head, and the power head is slidably connected to the guide rail; the main drill rod system is rotated and fixed by the power head system, and the secondary drill rod system, the drilling rig platform, the mast, the guide rail, and the crown block together form a linkage structure; the main drill rod system, the secondary drill rod system, and the guide rail are in the same plane, and the secondary drill rod system is adjusted in position within the plane to achieve coaxial docking with the main drill rod system; The main drill rod system includes a main drill rod support plate, a main drill rod, a main oil cylinder, and a main connecting rod; the auxiliary drill rod system includes an auxiliary drill rod support plate, an auxiliary drill rod, an auxiliary oil cylinder, an auxiliary connecting rod, an auxiliary drill rod winch, and an auxiliary drill rod wire rope; the guide rail is slidingly connected to the main drill rod support plate and the auxiliary drill rod support plate, a power head winch is connected to the mast by bolts, and the auxiliary drill rod winch is connected to the auxiliary drill rod wire rope by bolts, and the auxiliary drill rod wire rope passes through the overhead crane and is connected to the swivel joint on the auxiliary drill rod, the auxiliary connecting rod is hinged to the auxiliary drill rod support plate and the swivel joint on the auxiliary drill rod, and the auxiliary oil cylinder is hinged to the auxiliary drill rod support plate and the auxiliary connecting rod; the main connecting rod is hinged to the main drill rod support plate and the swivel joint on the main drill rod, and the main oil cylinder is hinged to the main drill rod support plate and the main connecting rod.

2. A drilling rig with automatic drill pipe connection according to claim 1, characterized in that: The power head system includes a power head, a power head winch, and a power head wire rope; the power head is connected to the power head winch through the power head wire rope, and the power head wire rope is divided into an upper rope and a lower rope. One end of the upper rope is connected to the power head winch, passes through the pulley at the top of the mast and is fixed to the upper part of the power head, and one end of the lower rope is connected to the power head winch, passes through the pulley at the bottom of the mast and is fixed to the bottom of the power head, and the power head is slidably connected to the guide rail.

3. The drilling rig with automatic drill pipe connection according to claim 1, characterized in that: An operating platform is welded on the drilling rig platform, and a safety fence is set around the operating platform. A fixed rod is welded on the operating platform, and a fixed collar is welded on the upper end of the fixed rod; a safety lasso is set on the secondary connecting rod, the safety lasso is put on the upper part of the secondary drill rod, and the fixed collar is put on the lower part of the secondary drill rod.

4. The drilling rig with automatic drill pipe connection according to claim 2, characterized in that: The power head winch is a bidirectional pressure winch.

5. The drilling rig with automatic drill pipe connection according to claim 3, characterized in that: The diameter of the fixing ring ranges from 100 mm to 400 mm.

6. The drilling rig with automatic drill pipe connection according to claim 3, characterized in that: The safety noose is a steel strand.

7. A construction method for a drilling rig with automatic drill pipe connection, characterized in that: The construction is carried out using the drilling rig with automatic drill pipe connection according to claim 1, and the specific construction steps are as follows: Step 1: Drilling Rig Assembly and Preparation Select the appropriate drill bit according to the different strata, match the main drill rod, auxiliary drill rod and mast of different lengths according to the designed pile length, and assemble the drilling rig according to the drilling rig assembly instructions; Step 2: Lowering the main drill pipe The drill rod holder on the power head clamps the main drill rod, and the power head starts to rotate. The power head winch is started, and the power head moves downward along the guide rail through the power head wire rope. At the same time, the rotary joint on the main drill rod pulls the main drill rod support plate downward through the main connecting rod and the main oil cylinder, allowing the drill bit to drill into the soil. When the power head moves downward to a distance of 30cm~50cm from the upper part of the operating platform, the power head winch is stopped, the power head stops rotating, the drill rod clamp on the power head is loosened, the power head winch is started, and the power head is pulled upward along the guide rail by the power head wire rope. When the power head moves to the upper end of the main drill rod, the power head winch is stopped, the drill rod clamp on the power head is clamped, the power head starts rotating, the power head winch is started, and the power head is pulled downward along the guide rail by the power head wire rope until the power head and the upper end of the main drill rod move together to a position 30cm~50cm above the operating platform; Step 3: Drill pipe connection Remove the swivel joint of the main drill pipe, retract the main oil cylinder to separate the main connecting rod with the swivel joint from the main drill pipe, release the connection between the fixed collar and the auxiliary drill pipe, retract the auxiliary oil cylinder to make the joint of the auxiliary drill pipe and the main drill pipe coaxial, lower the auxiliary drill pipe by hoisting it, ensure that the auxiliary drill pipe is connected to the main drill pipe, insert a pin at the joint between the main drill pipe and the auxiliary drill pipe, and the drill pipe connection is completed; Step 4: Lower the auxiliary drill pipe into the hole Start the power head winch, pull the power head upward along the guide rail through the power head wire rope until the power head reaches its maximum ascending stroke, stop the power head winch, clamp the drill rod clamp on the power head, start the power head rotation, start the power head winch, pull the power head downward along the guide rail through the power head wire rope, and at the same time, the rotary joint on the auxiliary drill rod pulls the auxiliary drill rod support plate downward through the auxiliary connecting rod and auxiliary oil cylinder until drilling reaches the designed depth; Step 5: Lift the drill pipe The order of lifting the drill is in the reverse order of the drilling sequence until the drill bit is lifted above the ground.

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